1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
//! ra_cfg defines conditional compiling options, `cfg` attibute parser and evaluator
use std::iter::IntoIterator;
use ra_syntax::SmolStr;
use rustc_hash::FxHashSet;
mod cfg_expr;
pub use cfg_expr::{parse_cfg, CfgExpr};
/// Configuration options used for conditional compilition on items with `cfg` attributes.
/// We have two kind of options in different namespaces: atomic options like `unix`, and
/// key-value options like `target_arch="x86"`.
///
/// Note that for key-value options, one key can have multiple values (but not none).
/// `feature` is an example. We have both `feature="foo"` and `feature="bar"` if features
/// `foo` and `bar` are both enabled. And here, we store key-value options as a set of tuple
/// of key and value in `key_values`.
///
/// See: https://doc.rust-lang.org/reference/conditional-compilation.html#set-configuration-options
#[derive(Debug, Clone, PartialEq, Eq, Default)]
pub struct CfgOptions {
atoms: FxHashSet<SmolStr>,
key_values: FxHashSet<(SmolStr, SmolStr)>,
}
impl CfgOptions {
pub fn check(&self, cfg: &CfgExpr) -> Option<bool> {
cfg.fold(&|key, value| match value {
None => self.atoms.contains(key),
Some(value) => self.key_values.contains(&(key.clone(), value.clone())),
})
}
pub fn is_cfg_enabled(&self, attr: &tt::Subtree) -> Option<bool> {
self.check(&parse_cfg(attr))
}
pub fn atom(mut self, name: SmolStr) -> CfgOptions {
self.atoms.insert(name);
self
}
pub fn key_value(mut self, key: SmolStr, value: SmolStr) -> CfgOptions {
self.key_values.insert((key, value));
self
}
/// Shortcut to set features
pub fn features(mut self, iter: impl IntoIterator<Item = SmolStr>) -> CfgOptions {
for feat in iter {
self = self.key_value("feature".into(), feat);
}
self
}
pub fn remove_atom(mut self, name: &SmolStr) -> CfgOptions {
self.atoms.remove(name);
self
}
}
|
